Pitting Corrosion Behavior of Ultra-fine Lamellated Al-4%Cu Alloy

doi:10.11902/1005.4537.2021.041

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (2): 274-280 DOI: 10.11902/1005.4537.2021.041

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Pitting Corrosion Behavior of Ultra-fine Lamellated Al-4%Cu Alloy

XIN Yechun, XU Wei, ZHAO Dongyang, ZHANG Bo(

)

Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

The pitting corrosion behavior of ultra-fine lamellated (UFL) Al-4%Cu alloy prepared by cold rolling at room temperature has been studied by means of scanning electron microscope (SEM), transmission electron microscope (TEM), microhardness tester and potentiodynamic polarization measurement aiming to understand the effect of element segregation and precipitates at grain boundaries on pitting corrosion potential. The result shows that the average lamellar spacing of cold rolled Al-Cu alloy is 159 nm and there exists obvious segregation of Cu at boundaries. The pitting corrosion potential of the cold rolled Al-Cu is found to be similar to that of the coarse grain ones. After aging treatment, the pitting corrosion potential decreases obviously because of precipitation of second phases at grain boundaries. These results indicate that the element segregation at grain boundaries has no significant effect on the pitting corrosion behavior of Al-Cu alloy, while the precipitation of second phases rich in Cu can have an obvious effect on the pitting corrosion behavior.

Key words: Ultra-fine lamellar element segregation precipitates pitting corrosion

Received: 05 March 2021

ZTFLH:

TG174

Fund: National Key Research and Development Program of China(2017YFB0702103)

Corresponding Authors: ZHANG Bo E-mail: bxz011@imr.ac.cn

About author: ZHANG Bo, E-mail: bxz011@imr.ac.cn

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Cite this article:

XIN Yechun, XU Wei, ZHAO Dongyang, ZHANG Bo. Pitting Corrosion Behavior of Ultra-fine Lamellated Al-4%Cu Alloy. Journal of Chinese Society for Corrosion and protection, 2022, 42(2): 274-280.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.041 OR https://www.jcscp.org/EN/Y2022/V42/I2/274

Fig.1 Characterizations of UFL structures for the Al-4%Cu alloy: (a) TEM micrograph, (b) related statistical size distribution; (c, d) elemental mappings of red rectangular region marked in Fig.1a, (e) EDS line-scan of Al and Cu along the white line in Fig.1d, there is obvious Cu segre-gation at the lamellar boundary

Fig.2 Variation of Vickers hardness with annealing temperature

Fig.3 TEM micrograph (a) and HAADF-STEM image (b) of cold rolled Al-4Cu annealed at 150 ℃ for 1 h (black arrows indicate θ-Al₂Cu while white arrows indicate metastable phase θ^')

Fig.4 Variation of Vickers hardness of clod UFL Al-4%Cu at 80 ℃ with aging time (a), SEM-ECC images of UFL Al-4%Cu annealed for 0 h (b), 12 h (c) and 72 h (d)

Fig.5 Potentiodynamic polarization curves of CG, as deformed and sensitized Al-4%Cu samples in 0.6 mol/L NaCl solution (pH7) (a), corrosion morphology of CG (b), as deformed (c) and sensitied Al-4Cu sample (d) after immersed for 72 h (b~d)

Fig.6 Pitting corrosion morphology of sensitized UFL Al-4%Cu after immersed in NaCl solution (a), Al (b), Cu (c) and O (d) element mappings in the rectangular region marked in Fig.6a

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